GUNE-SVX001A-EN
31
Maintenance
Periodic Service
Important:
The duct furnace and vent system should be
checked once a year by a qualified
technician.
All maintenance/service information should be recorded
accordingly in
“Gas Equipment Start-Up,” p. 30
.
To check gas tightness of the safety shut-off valves, turn off
the manual valve upstream of the appliance combination
control. Remove 1/8-inch pipe plug on the inlet side of the
combination control and connect a manometer to that tap.
Turn the manual valve ON to apply pressure to the
combination control. Note the pressure reading on the
manometer, then turn the valve OFF. A loss of pressure
indicates a leak. If a leak is detected, use soap solution to
check all threaded connections. If no leaks are found,
combination control is faulty and must be replaced before
putting appliance back in service.
All Maintenance/Service info should be recorded
accordingly in
“Gas Equipment Start-Up,” p. 30
. Should
maintenance be required, perform the following
inspection and service routine:
1.
Inspect the area near the unit to be sure that there is no
combustible material located within the minimum
safety clearance requirements listed in
.
2. Turn off the manual gas valve and electrical power to
the duct furnace.
3. Remove access panel.
4. To clean or replace the burners:
a. Disconnect the gas inlet pipe.
b. Remove the four (4) screws that hold the manifold
in place, and remove the manifold, gas valve, and
gas inlet pipe assembly.
c. Visually inspect the burners and heat exchanger
tubes for signs of soot or debris.
d. If burners require cleaning, they can be cleaned
with a wire brush and/or compressed air.
e. If inside surface of heat exchanger tubes require
cleaning, remove manifold bracket sub-assembly
by removing four (4) screws holding it in place.
5. With the burners removed, use a flexible wire brush
and compressed air to clean the inside surfaces of the
heat exchanger tubes.
6. Inspect air inlet for blockage/debris. Clear if any found.
7.
Reassemble the duct furnace by replacing all parts in
reverse order.
8. Complete the appropriate unit start-up procedure as
given in the Operation section of this manual (see
lighting instruction plate on the access side of the unit).
9. Check all gas control valves and pipe connections for
leaks.
10. Check the operation of the automatic gas valve by
lowering the setting of the thermostat, stopping the
operation of the gas duct furnace. The gas valve should
close tightly, completely extinguishing the flame on
the burners.
11. Check lubrication instructions on power vent motor. If
oiling is required, add one or two drops of electric
motor oil as follows:
a. Light Duty—After 3 years or 25,000 hours of
operation.
WARNING
Hazardous Voltage and Gas!
Failure to turn off gas or disconnect power before
servicing could result in an explosion or electrocution
which could result in death or serious injury. Turn off
the gas supply and disconnect all electric power,
including remote disconnects, before servicing the unit.
Follow proper lockout/tagout procedures to ensure the
power can not be inadvertently energized.
WARNING
Check Gas Tightness of Safety Shut-Off
Valves Annually!
Gas tightness of the safety shut-off valves must be
checked at least on an annual basis. Failure to ensure
gas tightness of the safety shut-off valves could result
in an explosion which could result in death or serious
injury.
WARNING
Check and Test Safety Devices!
It is the service technician’s responsibility to check all
safety controls! Check and test the operational
functions of all safety devices supplied with this unit,
and ensure that all are operating effectively. Failure to
do so could result in unsafe conditions and could result
in death, serious injury or property damage.
WARNING
Risk of Fire!
Under no circumstances should combustible material
be located within the clearances specified in this
manual. Failure to provide proper clearance could result
in death or serious injury, and property damage.
NOTICE:
Power Vent Motor Damage!
Never over oil the power vent motor or premature
failure may occur!
